Plastic composition.



,so forth, an

when ground .and mixed UNITED STATES HENRY El. SPACKMAN,

VANIA, ABBIGNORBTO HENRY 8. SPACKMAN ENGINEERING COMPANY, OF

PATENT OFFICE.

OF ARDMOHE, AND ELLIS W. LAZELL, Oi" PHILADELPHIA, PENN-SYL- llllLA 1) EL- PHIA, PENNSYLVANIA, a CORPORATION or saw JERSEY.

' rmsrlo comosrrron.

Compositions, of which the i0 owing is a specification.

This. invention relates vto plastic or cementitious compositions comprising lasters and relates more-particu arly to wall plaster compositions and'to the reparation thereof 'b the incorporation o hydraulic calcium uminate iccteleratil'lfil material or the likem'th lime or other cart y alkali mas tcrial, suitable proportions of regulating material', such as plaster of paris, and-of pozzuolanic or other material being'incorporated, if desired. a

Hydraulic calcium aluminate compounds maybe readily prepared by calcining suitable mixtures of ely ground lime and bauxite or other alumina ccmpiounds, such ns'kaolinor high alumina clays, ifih alumina s1 and so forth, thematerials eing prefera ly combined in such pro erticns that 'from one to three molecules of ime are presant to one molecule of alumina, sufficient lime being of course added to combine with the silica or other acid components which may be present in connection with the aluminous material 'added'to .form the mixture.

.Such mixed materials may be rendered hydraulic and given a very initial set wit water by calcining or sintering them, and if desired the temperature may then in some cases be carriedstill higher so as to effect fusion. It is of course understood that iron or similar material may be used in some cases to replace to some extent at; least the alumina in this accelerating material, and that other earthy alkali material such as magnesia and so forth, may be substituted for part at least of the lime combined therewith, such e uivalent or substitute accelerating material wing designated hydraulic earthy alkali acceler atin compounds of alumina-like material.

P sets: or cemen'tltlous compositions suitable for plasters in building operations may be formed by the incorporation of a comparatwely small proportionoi the hydraulic enlspecification pl Letters Patent. Application on Jul] a, 1m. Bori'al n use.

Patented Nev. s, 1sos.

oium aluminate material or the substitute hydraulic earthy alkali accelerating compounds of alumina-like material with a large proportion of oxide or preferably hydrates of me or similarly acting earthy alkali material, that is, free or. loosely combined limo,

to al combining or capabl c oi combining with hydraulic calcium alumina-to maternal and L1) operating sihclous materml. Various proporcalcium aluminatc accelerating nmtvriul, for "instance, which elloct the desired qu ickness of set and'increase of stren 'terial ma of course bear ded andincorpornted with finel' divided oxid or hvdratc of lime before it is used.

worsted by gages the dasticauatcrial with water, or it may. be r issolved or incorporated in the water used in agin r thecm-thy alkali material. Pl'fellfifl however, the accelerating material ant suitable controlling material, such as sulfate of lime, sulfuric acid, molasses, glue, starch and so forth, may he uniformly incorporated with the lime or other materialsc ,ss'to form a finely ground lastic'material becomin immediat oly effectwe when water is addcc thereto.

An illustrative plastic composition may be prepared by incorporating eighty-six parts of d hydrated limo, ten parts of calcium aluproximatel forty per ccntaof alumina, two

'arts oi p aster o pal-is and two arts of mfusorial earth. This material w ion the components are flier-(nigh ly in'corporated and 'finely ground togcthcgrso that ninety-five per cent. pass through a 1 UO-inesh sieve has an initial setting time of about four hours and is completely set in about fifteen hours according to the standard Vicat needle test. A sample of this highly oementitious material when tested in the ordinary way with three arts of (-ou'murrcial sand in air gives the folowing high tensile strengths: -At 7 days 125 pounds per square inch and at 28 days 15] pounds per s uare inch. A plaster com osi-' tion having lt'flx tensile strength and t ere- ;forc Iwing'm ro desirable as a enerul well 'lfinish in building opvndious may a snuilarly tions of controlling material and of hydraulic th of the plastic ma Male, baryta, strontia and Sllllllltflllltor other earthy alkali material at any time The iincl divided aocelcrating material may be aulcd and incortheworkman lie-fur or after. he

mmate accelerating material containing up tomber 27, 19

hydrated lime, seven cium aluminate acce taming approximately forty per cent. of alumina, three )arts of plaster of pans and two parts of basic blast furnace slag. This plaster material when tested in the ordinary way with three parts of commercial sand in an gl ms about fifty pounds tensile strength per square inch at seven days and about ninety pounds at twenty-eight days. When used as a plaster as much as five parts of commerclnl sand can be readily incorporated therewith and give the desired spreading qualities for wall finishing the plaster hardenin completely so as to allow the application 0 a fin ishing coat in abou t twelve hours.

Having described this invention in connccti on with a number of illustrative ingredients, proportions, formulas and methods of prepapc'rta of hydraulic calration, to the details of the disclosure in this a case (which is a continuation, that is contains -ubject-matter taken from lllnited States patent a iplieation, 394,916, filed Sep- (57), the invention is not of course to be limited.

What is claimed as new and what is desired to be secured l1- Letters Patent is set forth in the appcndc. claims.

1. The plaster composition comprising npproxil'nately eighty-e1ght parts of hydrated limo, seven parts of hydraulic calcium aluminatc accelerating material containing about forty per cent. of alumina, three arts of plaster of paris and two parts of blast furnace slag.

2. The plaster composition comprising approximately eighty-eight parts of hydrated lime, seven parts of calcium aluminate accelerating material, plaster of pariscontrolling pictorial and hardening material.

3. The plaster composition comprising apof hydrated 4. The plaster com osition counrising a large proportion of hyr rated lime with which hydraulic calcium ahuninnt-c accelerating material and, controlling material have been incor iorated. i

llac plaster composition comprising a large proportion of lime with which a small ralingmaterial .con-

-wit

proportion of calcium alum inate accelerating material has been incor mrated.

6. The plaster composition comprising a large proportion ol" earthy alkali in u tcrial mcluding lime with which aamall n'oportion of hydraulic calcium aluminate uccclcratil'lg material and controlling nuitcrial has been incorporated.

7. The plaster composition comprising a large proportion of earthy alkali nmtorial with which a small proportion of calcium aluminatc accelerating material and calcium sulfate controlling material has becn'incorporated. A t

8. The plaster composition comprising a large proportion of earthy alkali material with which a; small proportion oi calcium aluminate accelerating material has been ir corporatcd; a

9. The plaster composition comprising a lar e proportion of earthy alkali material l1 which a small proportion of'hydraulin earth alkali accelerating compounds of alumina-like material has been incorporated to increase the quickness of set and tensile strength of the composition.

l 10. The plaster com osition col-uprising :1. large proportion of cart 1y alkali material in eluding lime with which small proportions .of hydraulic earthy alkali ac ee crating compounds of alumina-like material and of roguating material have been incorporated to increase the' quickness of set and tensile strength of the composition.

.11. The plastcucomposition com'prisinp large proportions of lime with which a sum. l proportion of hydraulic'earthy alkali accelerating compounds of alumina-like material has been incor ,oratcd increasing the quick-- ness of set of tlie composition;-

12. Thc plaster composition containing n large percentage ofearthf alkali material i'n-- eluding lime with whic calcined calcium aluminate accelerating material has been incorporated so as to add not more than ten per cent, of aluminathcreto;

.HE'NRY S. SPACKMAN. ELLIS W. LAZELL. Witnesses:

LILLIE Fnrrz, Louis F. Sonuon. 

